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MILLIMETER-WAVE ULTRA-WIDEBAND PCB 180˚ HYBRID FOR 12-67 GHZ

By C. Pfeiffer, T. Steffen, and B. Tomasic

Full Article PDF (990 KB)

Abstract:
A myriad of ultra-wideband (UWB) 180˚ hybrids have been reported that operate at frequencies below 20 GHz. However, parasitics from printed circuit board (PCB) transmission lines become significantly more problematic as the frequency is extended to mm-wave frequencies. Here, abroadside coupled transmission line hybrid is investigated for operation at 12-67 GHz. It is shown that a parasitic time delay for the odd mode exists at the junction between coupled and uncoupled transmission lines. A heterogeneous multi-layer PCB stack-up is leveraged to compensate for the junction parasitics over an ultra-wide bandwidth. Measurements have an insertion loss between 2 and 12 dB across the band, < 1.5 dB amplitude balance, < 10˚ phase balance, and > 19 dB isolation.

Citation:
C. Pfeiffer, T. Steffen, and B. Tomasic, "Millimeter-Wave Ultra-Wideband PCB 180˚ Hybrid for 12-67 GHz ," Progress In Electromagnetics Research M, Vol. 92, 213-221, 2020.
doi:10.2528/PIERM20030303
http://www.jpier.org/pierm/pier.php?paper=20030303

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